Junk: vintage items, that have either been remade or repaired using old or worn materials.
The Depression era Thunderbird necklaces from Santo Domingo really worked up a storm of ideas about saving and reusing materials to make new things. Take for instance this Depression era bolo tie, using wire to string a pair of turquoise nuggets on a piece of leather cord. The entirely hand made appearance is really neat. Also using an old thunderbird earring strung on old trade beads looks cute! This also connected some new dots to boro, denim repair, and Japanese aesthetics.
Interestingly enough it would be nice to dwell more on the idea of nature-worshiping societies (Native Americans and Shinto for example) generally regarding leftovers as material, not trash. Definitely something more to consider there...
Anyways back on topic. Junk. For the sake of avoiding confusion Junk is not a negative word in this context. It is just the state in which the object exists. The state of Junk. The majority of junk is overlooked by pickers and vintage collectors, there is an abundance of it out there and it is really up to the individual to find their preferred junk.
Take for instance denim repair.
I assume from looking and observing denim repair photos on the net and instagram that there is a preference for "clean" repairs. The word clean here suggests that the stitching is not seen and the repair is almost invisible. This is the opposite of Junk. Junk has to have character, it really has to be unique.
Friend and constant source of inspiration John Dennis, of Sam Roberts LA understands the Junk aesthetic well. He constantly incorporates miscellaneous items into his products. Old coins, trade beads, and 19th century calico fabric just to name a few. They're beautiful, and especially easy to arrange into an individual style.